The River Kirkaig is a river that drains the the lochs lying south of Suilven in south-western Sutherland. It runs for 3¼ miles from the western end of Fionn Loch to its mouth into Loch Kirkaig at Inverkirkaig. Along its route the river plunges over the impressive Falls of Kirkaig. For its entire length it forms the border between Sutherland and Cromartyshire.
- Map of the start of the Kirkaig: 58°6’29"N, 5°11’16"W
- Map of the mouth of the Kirkaig: 58°7’18"N, 5°15’55"W